EX-A8 – 8-channel analogue input module
The EX-A8 is a compact analogue input module designed to measure eight 4–20 mA current signals in industrial automation systems. It enables data readout via an RS-485 interface using the Modbus RTU protocol, allowing for easy integration with SCADA systems, PLCs and data loggers.
The device has been designed for reliable operation in industrial applications, offering high measurement accuracy, input protection and clear LED diagnostics.
Key features
- 8 analogue inputs 4–20 mA
- 8 LEDs indicating measurement range exceeding
- Power supply indicator LED
- Detachable connectors for power supply, RS-485 and analogue inputs
- RS-485 MODBUS SLAVE serial port
- Configuration of analogue inputs and serial port via software tools
- 12/24 V power supply
- DIN rail mounting
- 36-month warranty
Functionality and application
The EX-A8 module enables the simultaneous measurement of eight current signals in the 4–20 mA standard, commonly used in industry for transmitting signals from sensors (e.g. temperature, pressure, level or flow).
The measurement inputs are referenced to the negative power supply terminal and equipped with protection against incorrect connection. This makes the module suitable for environments with an increased risk of interference and installation errors.
Communication takes place via an RS-485 interface using the Modbus RTU protocol, ensuring broad compatibility with industrial automation devices.
- 8 4–20 mA measurement inputs
- RS-485 communication port (Modbus RTU, Slave mode)
- Measurement resolution: 1 µA
- Accuracy: ±0.2% of range (at 25°C)
- Input protection against voltage connection up to 30 V
- Reverse polarity protection
- LEDs indicating measurement range exceeded
- LED indicating power supply presence
- Configuration via dedicated software tools
- Mounting on a 35 mm DIN rail
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